Telephone-receiver.



No. 758,795. PATENTED MAY 3, 1904. E. H. STRAUSS.

TELEPHONE RECEIVER.

APPLICATION FILED JULY 25, 1902.

No MODEL.

lofi-2136665' n.; '.u- Pneus co, Pnoommo. wAsmNmou, n. c

UNITED STATES Patented May 3, 1904.

PATENT OEEICE.

TELEPHONE-RECEIVER.

SPECIFICATION forming part of Letters Patent No. 758,795, dated May 3, 1904.

Application tiled July 25, 1902. Serial Nn. 116,975. (No model.)

To 0J/ whrmt it muy] concern,.-

Be it known that I, EEN usr HUGO STRAUss, a citizen of the United States, residing' at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in rlelephone-ldeceivers; and I do hereby declare the following' to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to certain improvements in telephones, more especially receivers therefor. i

It has for its object, among' other thing's, to augment the sound-transmitting capacity of the receiver, to provide for the ready adjustment of the pole-pieces or magnetic field with relation to the diaphragm, to house or conceal the point of connection between the receiver and its suspending' cord or conductor, and effect the compact arrangement or disposition of the parts.

It consists of the combination of parts, including' their construction, substantially as hereinafter more fully disclosed, and specifically pointed out in the claims.

ln the accompanying` drawings, Figure l is a partly-longitudinal section of my invention in its preferred form. Fig. 2 is a view in side elevation with the casing removed. Fig. 3 is a transverse section taken through one set of the magnetic poles. y

It will be understood that I do not limit myself as to details, as they may be changed without departing' from the spirit of my invention and said invention yet remain intact and be protected.

In carrying' into effect my invention I employ the usual hard-rubber shield or casing l, with, however, a single or central opening' la through one end for the passage of the receiver-suspending cord 1X, said cord, unlike the ordinary way of connecting up the same with said casing or shield upon the outside by the aid of posts, being' connected up directly with the magnet within said casing or shield. Arranged within said casing or shield l is a preferably stamped-up brass cup suitably fitted to the interior of the ared end portion thereof, but having' an annular flange 2 resting' upon the forward edge or surface of said flared end portion. Fitted or screwed upon this end of said shield or casing and engaging said flange of said cup is a closure 2", with the usual central opening'therethrough and adapted to clamp the diaphragm 3 in position upon said cup. Also arranged within said shield or casing are lateral magnetic poles 4. a, and centrally of the magnetic poles 4 within the cup 2 is a central magnetic pole piece or core 5, upon which is wound insulated wire forming a single helix or coil 5. Said helix or coil is connected or wired up by insulated conductors or wires 6 6, passing' via the pole-pieces 4 il to and connecting with the receiver-suspending' cord 1X, in turn connecting' up, as usual, with an electrical battery, &c. Said lateral magnetic pole-pieces i 4c are connected up with each other and with the cent 'al magnetic polepiece 5 by means of lateral plates 7 and a central plate 8 and suitable screw-bolts 9 9, passing' through the pole-pieces 4 4, one of said bolts also passing through said plates. Said central pole-piece or magnet 5 has an elongated opening' or slot 5X, and in extensions 2X of the cup 2 are similar openings or slots 21m, through which openings or slots passes the bolt 9 to permit of the adjustment of thc magnetic polo 5 within the cup 2 with relation to the diaphragm 3, according as circumstaces may require. Said adjustment is effected by first loosening the bolt 9 and g'rasping with the hand the part 5 or 5", the two being connected together and moving' the same in the required direction or toward said diaphragm and then again tightening said bolt to cause the parts I 4: to forcibly engage the part 5" to retain the same with the part 5 firmly in position. The parts LI 4C are accordingly adjusted or moved by moving' said bolt previous to the tighteningthereof, this latter movement being' permitted by means of the slots 2.

It will be observed from the foregoing that the diaphragm is adapted to be brought or adjusted Very close to the central or lateral polepieces at that end of the receiver, whereby the electrical sound-waves are more directly delivered upon said diaphragm, consequently promoting' o1' augmenting the transmission of the sound of the voiee entering' the receiver. Also,

.effect the adjustment of said poles with relathat the diaphragm being held upon the metallic cup, as above noted, and a metal surface not being affected by heat, as is rubber, there is less liability of interference from that cause of the adjustment of said diaphragm as Where the last-named is seated directly upon the ordinary form of rubber casing or shield as heretofore. Also, that a combined single and double pole receiver is obtained by the abovedescribed parts, having the effect to still further intensify the sound-waves. I also produce by this arrangement what I term an annular magnetic Held, which is more even or uniform than obtainableby the ordinary form of receiver. l

The various parts of this receiver, including the means for effecting the connection between the magnetic poles and the receiver-suspending cord or medium, are arranged or disposed wholly within the shield or casing thereof. Also, a single screw only is employed for effecting both the adjustment of the magnetcontaining cup and the retention of the magnet in position in said cup.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. A telephone-receiver embracing a cup arranged within the ordinary shield or casing and a series of magnetic poles, including a central pole, said cup having elongated slots therein, and means connecting said magnetic poles and said cup, extending through said slots to tion to the sound-transmitting diaphragm, said central pole being adjustable independently of the other poles.

2. A telephone-receiver embracing a series of magnetic poles including a central pole arranged at or near the diaphragm end thereof, electrically connected up and arranged close 1 to the diaphragm, and a central plate, the central pole being adjustably connected to said central plate.

3. A telephone-receiver, embracing series of `magnetic poles including a central pole, arranged at the diaphragm end, a central plate adjustably connected to the central pole, and lateral plates connecting with the corresponding poles.

4. A telephone-receiver, embracing series of magnetic poles including a central pole, a central plate, adjustably connected to the central pole, lateral plates connected to the corresponding poles and means effecting connection between said central and lateral plates.

5. A telephone-receiver, embracing series of magnetic poles including a central pole, a central plate adjustably connected with the central pole, lateral plates connecting with the corresponding poles, and a metallic cup containing the magnets or poles at the diaphragm end of the receiver, the poles or magnets at said end of the receiver being adjustably connected to said cup.

6. A tele phone-receiver, embracing a casing or shield, series of magnetic poles, including a central pole, arranged within said casing and electrically connected up, a cup containing the poles at the diaphragm end of the receiver, a central plate, said central pole being adjustably connected to said central plate, and a cord or conductor connected up with said magnets, within said casing, saitl casing having a central opening through one end for the passage of said cord, substantially as set forth.

In testimony whereof 1 affix my signature in presence of two witnesses.

ERNEST HUGO STRAUSS.

W'itnesses:

R. A. BURTON, E. ZIPPERLY. 

